package com.hmdp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

/**
 * CLassName: RedisIdWord
 * Description:
 * Author: wuzhixiang
 * Date: 2024-11-01 14:18
 * Version: 1.0
 */
@Component
public class RedisIdWorker {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    //开始时间戳2024-1-1-0-0
    private static final long BEGIN_TIMESTAMP = 1704067200L;

    private static final int COUNT_BITS = 32;

    public long nextId(String keyPrefix) {
        //1 生成时间戳
        long nowSecond = LocalDateTime.now().toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond - BEGIN_TIMESTAMP;
        //2 生成序列号
        //2.1 获取当前日期，精确到天
        LocalDateTime now = LocalDateTime.now();
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        //2.2 自增长
        long count = stringRedisTemplate.opsForValue().increment("icr:" + keyPrefix + ":" + date);
        //3 拼接并返回
        return timestamp << COUNT_BITS | count;
    }

    /*public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.of(2024, 1, 1, 0, 0, 0);
        long epochSecond = localDateTime.toEpochSecond(ZoneOffset.UTC);
        System.out.println(epochSecond);
    }*/
}
